10.13 Assuming that the compression process takes place through infinitesimal stages, calculate the isentropic compressor efficiency under the following conditions. The compression takes place from an initial stage of 300 K and one atmosphere to a final stage of 500 K and four atmospheres. Compare this value with the small stage efficiency. Ans: n. =72.8%; Ns=77.5%

10.13 Assuming that the compression process takes place through infinitesimal stages, calculate the isentropic compressor efficiency under the following conditions. The compression takes place from an initial stage of 300 K and one atmosphere to a final stage of 500 K and four atmospheres. Compare this value with the small stage efficiency. Ans: n. =72.8%; Ns=77.5%

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

A geothermal power plan has the following data: specific enthalpy at final stage equal to 28.5 KJ/kg, specific enthalpy at well head side equal to 42.8 KJ/kg, mass of the liquid equal to 18 kg. Calculate the work-power capacity of the plant. 457.50 KJ B 357.25 KJ (c) 292.35 KJ 257.40 KJ
16. Two pounds of air at 100 psia occupy 4 cu ft; the air is heated and expands at a constant pressure until its volume is increased 300. per cent; after that the air expands adiabatically to 50 psi, and finally its pressure is 1educed isochorically to 15 psi. Determine the changes of available and unavailable energy and of the entropy between the starting and final condi- tions. Assume the refrigerator temperature to be 70 F, and use everage specific heats for the temperature range involved.
24A petrol engine working on the constant volume cycle has a compressioni ratio of 9 to 1. If the pressure and temperature of the petrol-vapor air mixture at the beginning of compression are 99.30 kPa and 38 C respectively. Calculate the temperature at the end of compression assuming it follows the law PV = C. A 383.45 C B. 728.45°C C. 899.30°C D. 883.48°C
An air-standard cycle with variable specific heats is executed in a closed system with 0.0055 kg of air and consists of the following three processes: 1–2 v = Constant heat addition from 95 kPa and 17°C to 380 kPa 2–3 Isentropic expansion to 95 kPa 3–1 P = Constant heat rejection to initial state Use data from tables. Determine the thermal efficiency. The thermal efficiency is %
An ideal gas Diesel engine, that has an inlet temperature, pressure and compression ratio of 22 0C and 102 kPa 21:1 respectively. The maximum cycle temperature is 1,276 0C. Take Specific heat at constant pressure and constant volume for air as 1.005 kJ/kg K and 0.717 kJ/kg K respectively. Calculate the specific heat rejected during the cycle to one decimal place and include the correct SI unit.
4. A two-stage air compressor with an intercooler takes in air at 14.6 psia at 62 degree F anddelivers it at 502 psia. The temperature of the air leaving the intercooler is 62 degree F.Calculate the work required per pound of air delivered if compression isisentropic, ft-lbf/lbA. (-)108,072 ft-lbf/lb C. (-)168,072 ft-lbf/lbB. (-)118,072 ft-lbf/lb D. (-)128,072 ft-lbf/lb
Temperature, Pressure and Volume of air (Y=1.4) at the end of isentropic compression in an air standard Carnot heat engine cycle are 315.6 °C, 120 kPa and 0.05 m³ respectively. The volumetric ratio of the isothermal expansion (2-3) and that of isothermal compression ( V₁ ¹₁-3). The volumetric ratio the isentropic expansion (¹-6) and that of isothermal V/₂ compression (¹= 6). (Please draw a P-V diagram of the Carnot cycle) V₁ Calculate; a) The pressure, minimum Temperature and volumes of other states of the Carnot cycle. [ + b) The heat supplied and rejected by the cycle c) The efficiency of the cycle 星

! Required information Problem 09.034 - Ideal Otto Cycle with Variable Specific Heats - DEPENDENT MULTI-PART PROBLEM - ASSIGN ALL PARTS An ideal Otto cycle has a compression ratio of 8. At the beginning of the compression process, air is at 95 kPa and 27°C, and 760 kJ/kg of heat is transferred to air during the constant-volume heat-addition process. Take into account the variation of specific heats with temperature. The gas constant of air is R = 0.287 kJ/kg-K. Problem 09.034.a - State After Heat Addition in Variable Heat Capacity Ideal Otto Cycle Determine the pressure and temperature at the end of the heat-addition process. (You must provide an answer before moving on to the next part.) The pressure at the end of the heat-addition process is 3915.8 kPa. The temperature at the end of the heat-addition process is 1647.7 K.
An ideal otto engine , operating on the hot air standard with k= 1.3, has a compression ratio of 6.At the beginning of the compression the volume is 0.1982 cubic meter , the pressure is 15 psia and the temperature is 560 R .During the constant volume heating , 259 Btu are added per cycle . Find (a) c,(b) t3 ,(c) p3 ,(d) e, and (e) pm?
A four-stage single-acting air compressor running in an atmospheric at 87 kPa and 15°C has a F.A.D of 2.83 m³/min. The section pressure and temperature are 80 kPa and 32 °C respectively, the delivery pressure is to be 7 MPa. The temperature at the start of compression in each stage is 32 °C, take n=1.3 for all stages. calculate: 1. The intermidiate pressure ratio 2. The intermidiate pressure at first, second and third stages in kPa
At the beginning of compression in the otto engine cycle, P1= 101.35 kPa, T1 = 21 deg.C and Vi = 0.113 m². At the end of the compression process the pressure is 551.58 kPa. If 174.5 kJ/kg are added during the constant volume reversible. Heating process and the values of k and R for air are 1.4 and 0.287 kJ/kg.deg.K respectively. 2. a. Draw the P-V Diagram b. Draw the T-S Diagram c. Find the temperature at the end of compression d. Find the temperature at the beginning of expansion e. Find Heat removed f. Find the compression ratio g. Find the thermal efficiency
In a constant volume cycle, the pressure at the end of compression is 10 times that at the start, the temperature limits are 20 ° C and 1900 ° C. Determine i. Compression ratio, ii. Thermal efficiency and iii. Work done. Take R = 287 J/kg K, y = 1.4